Key for brake-shoes.



I PATENTED MAY 21, 1907. D. H. FAIRBANKS. KEY FOR BRAKE SHOES, APPLICATION FILED 00213.23, 1906 Wit-n 045% lUNlTEB KEY FQR BRAKE SHOES:

4 3 7 Specification of Letters Eetent. retested may 21, i2

Application filed October 23, 1906, Serial No. 3 20329.

To ml] whom it may concern:

Be it known that 1, DAVID H. FAIRBANKS, a citizen of the United States, residingat Nashville, in the county" offievidson and State otiennessee, have invented certain new and useful Improvements in Keys for Broke-Shoes, of which the following is a specification.

My invention relates to improvements in keys for brake shoes, and has for its object, to produce a key of this sort, of simple and economics] construction which will securely lock the brake shoe to the brake head, and further, to provide means ior outonisticsllv locking the key when sealed in the brake head and block so that the ports cannot occidentsily become disengaged.

with these objects in view, my invention comprises :1 key having lugs or herbs on up posit o laces thereof to engage ebutnients on the brake head and shoe to thereby lock the key in place, end the invention also consists in certain other novel features of construction, combination and arrsngL-nnent of ports substantially disclosed herein.

Figure 1, is at side elevation of en ridinary brake head and shoe, having my improved key spilied thereto, a portion of the wheel being shown. Fig. 2, is similar view of the hood and shoe, with psrts broken owey to more fully illustrate the key mount ed therein. Fig. 3, is e perspective view oi the key in detail. Fig. 4, is a similar view of the key in modified form;

My improved key is preferably stmnped or otherwise produced from z single piece ofsheet metal, and the entire key may be produced by the one stamping or forging operation, so that in the manufacture of my key,

the cost of production is reduced to e miniof the same Width and thickness'for its entire outer or convex side, the key is provided.

with another lug or barb similar to the first but on the opposite" side of the key. both. of

both of usual construction, the former having.

the pair of cars or lugs 7, and the letter, the lug 8, to he engaged between said ears, both the lug and having openings therethrough to receive the key. The key hen applied to the brake head, posses througl-i on o ening l in the upper portion of the hood, thence through the corresponding openings .in the head and shoe, and the end of the l'IGjT protrudes through on opening 10, in the lower portion of the brake hood. The key is made of spring metal, so that when driven into place, the herbs on the opposite feces thereof engage the lower side of l 3 openiz as in the esrs and heed, and this springing, action, the herbs secure lock the lzey in the brake heed. ii hen d to dirt ssenp his the parts for any re arson, the ljmrhs on 'l face of too key, and the key may then he readily removed by prying or dr ing; it up- Word. I have shown the herbs or I tongues on the key as being; re iguanr in shape, but they niey'hc of any shape that they perform. the proper iunctioi'i of locking the key after it has been driven in place. Also the number and location Orthe herbs 'may he varied to suit diiierent conditions.

in the modili d construction shown in Fig. 4, the key is oft-he some general shape, but at the point where the bzirhs or spring: tongues are struck up from the key, the motel the key is ex 'mnded. or sprnoutwardly as at 11, This expansion or Widening of the key may be accomplished by the die when the spring tongue ispunched or struck up froin the key. The key is driven into place as described, the swelled portions of the key sing contracted while pzissing through the open: ings in the brake head and shoe and then me pending after the key is seated in place, there oy securely locking the key against detachment.

Having thus described key are 5; wrong hack into ii-linenlent withthe have prcvidml 'prizcl'iimd and efficient key for Um 'purpu +1 sivnjod.

fur Ultlkfi shoes having lugs waits faces 'hm'nuf.

4 shoes inning elastic mums {firmed m1 op msih) {3100* in shs'mr; having a pin- HF'LHK up m1 opporunny dvtachml herelrom and m. opposite i'mcis ilmmf.

shoes having hzn'bs m K 119; hmgl (:5 Rim 1 up 1 17mm opp s-Ho faces 0 the kw A key 5'1 bra :0 P411095 hm'ing; cmnpmssk blo portions and spring" 'iung'mi s mljmrent said com '1 10 poi-lions.

A n 3 metal pm'flons, and w p v--jLniyl tongues struck up from the My said conl'prmsiulw portions.

Tn tP$ti1n0ny whereof iUha h signed my name in this sp cifivaiinn in tho prersmun uf two sub ing wwfituossvs.

DAVE!) H.

V. Suucmm (Dumwum. 

